diff options
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 533ff5c68970..4bb60048f583 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -4060,6 +4060,8 @@ This parameter controls whether the Speculative Store Bypass optimization is used. + On x86 the options are: + on - Unconditionally disable Speculative Store Bypass off - Unconditionally enable Speculative Store Bypass auto - Kernel detects whether the CPU model contains an @@ -4075,12 +4077,20 @@ seccomp - Same as "prctl" above, but all seccomp threads will disable SSB unless they explicitly opt out. - Not specifying this option is equivalent to - spec_store_bypass_disable=auto. - Default mitigations: X86: If CONFIG_SECCOMP=y "seccomp", otherwise "prctl" + On powerpc the options are: + + on,auto - On Power8 and Power9 insert a store-forwarding + barrier on kernel entry and exit. On Power7 + perform a software flush on kernel entry and + exit. + off - No action. + + Not specifying this option is equivalent to + spec_store_bypass_disable=auto. + spia_io_base= [HW,MTD] spia_fio_base= spia_pedr= |